<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2016/9/28 0028
 * Time: 下午 8:40
 */
header('Content-type:text/html:charset=utf-8');
function getFileExt($path){
    $ext = substr($path, strrpos($path,'.') +1);
    return $ext;
}
$path = 'C:\images\apple.jpg';
$ext = getFileExt($path);
echo "<p>文件路径; $path </p>";
echo "<p> 文件后缀; $ext</p>";